You need to put BOTH the "Danevangs PS 1.0 Common VIIC Shadow Maps" folder, AND the skin folder you want to use, i.e. "Danevangs PS 1.0 Type VIIC-std Blaugrau 58-1" folder, in your JSGME MOD directory, then install them with JSGME. They should not appear in the SH5 main directory! They just need to be treated as any other mod you might install.
I hope this makes it clearer.
I'll see if I can make the installation info in post #1 a little more precise.